How do I remove built up calcium deposits on ceramic bathroom tile?

I've found that soap scum removers such as scrubbing bubbles or lysol power bath will work. Spray it on, let sit for several minutes and then use a nylon scrubby to gently scrub the tile. Rinse then repeat if necessary.

lay a rag soaked with cleaning vinegar on for a little while. That should loosen any mineral build up. or perhaps CLR?

Use Coca Cola. Put some Coke in a spray bottle, spray the tiles then use the abrasive side of a kitchen sponge and rub. Rinse with water. I just did this to black tiles and it works like a charm!

You might try Bar Keeper's Friend". It is a powder that does not scratch anything and can be used on glass, hence the name. Use it as you would any powder cleanser. When I've had really stubborn problems, I've let it set on a wet surface to dissolve and that worked too. It will remove rust from almost anything too!

I’ve recently used Norwex descaler spray leave a bit , use a damp microfiber cloth it really works a bit pricey but it does work .

you can order from Amazon. I had tried about everything. This is a clear product with no cloudy rinsing .

CLR , calcium lime and rust, in the cleaning isle in walmart